CVE-2026-40296
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
PhpSpreadsheet vulnerable to XSS in HTML writer via custom number format codes
PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. The HTML writer skips htmlspecialchars escaping when a cell's formatted value differs from the original value. When a cell has a custom number format containing the text placeholder @ along with any additional literal characters (for example ". @", "@ ", or "x@"), the formatter replaces @ with the cell value and adds the extra characters, causing the formatted value to differ from the original and bypassing HTML escaping entirely. An attacker who can control the cell value and number format of an uploaded spreadsheet that is later converted to HTML and displayed to other users can achieve stored cross-site scripting. This issue is fixed in versions 5.7.0, 3.10.5, 2.4.5, 2.1.16, and 1.30.4.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
PhpSpreadsheet
- Vendor
- PHPOffice
- Product
- PhpSpreadsheet
- Platforms
- Unknown
- Default status
Unknown
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| >= 4.0.0, <= 5.6.0 | affected | Unavailable | Unavailable | Unavailable | None listed |
| >= 3.3.0, <= 3.10.4 | affected | Unavailable | Unavailable | Unavailable | None listed |
| >= 2.2.0, <= 2.4.4 | affected | Unavailable | Unavailable | Unavailable | None listed |
| >= 2.0.0, <= 2.1.15 | affected | Unavailable | Unavailable | Unavailable | None listed |
| <= 1.30.3 | affected | Unavailable | Unavailable | Unavailable | None listed |